examples of different built-in methods of servlet
textcolor.java - doGet()
calc.java - doPost()
ServletHeaders.java - getHeaderNames(), getMethod(), getRequestURL(), getServletPath(), getProtocol()
context_param.java - getServletContext() -> servlet context using web.xml
NewServlet.java - initialize parameters in deployment descriptor using web.xml
ReqInterface.java - getParameterNames(), getParameterValues() -> different types of get paramters methods.
register.java -> basic register page using mysql that takes various inputs with comfirm password validator.
login.java -> login page for the above created register page.
session management with servlet session and cookies using url rewriting, hidden fields, etc.